/usr/share/pyshared/eventlet/green/subprocess.py is in python-eventlet 0.9.16-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import new
import eventlet
from eventlet import greenio
from eventlet import patcher
from eventlet.green import os
from eventlet.green import select
patcher.inject('subprocess', globals(), ('select', select))
subprocess_orig = __import__("subprocess")
# This is the meat of this module, the green version of Popen.
class Popen(subprocess_orig.Popen):
"""eventlet-friendly version of subprocess.Popen"""
# We do not believe that Windows pipes support non-blocking I/O. At least,
# the Python file objects stored on our base-class object have no
# setblocking() method, and the Python fcntl module doesn't exist on
# Windows. (see eventlet.greenio.set_nonblocking()) As the sole purpose of
# this __init__() override is to wrap the pipes for eventlet-friendly
# non-blocking I/O, don't even bother overriding it on Windows.
if not subprocess_orig.mswindows:
def __init__(self, args, bufsize=0, *argss, **kwds):
# Forward the call to base-class constructor
subprocess_orig.Popen.__init__(self, args, 0, *argss, **kwds)
# Now wrap the pipes, if any. This logic is loosely borrowed from
# eventlet.processes.Process.run() method.
for attr in "stdin", "stdout", "stderr":
pipe = getattr(self, attr)
if pipe is not None and not type(pipe) == greenio.GreenPipe:
wrapped_pipe = greenio.GreenPipe(pipe, pipe.mode, bufsize)
setattr(self, attr, wrapped_pipe)
__init__.__doc__ = subprocess_orig.Popen.__init__.__doc__
def wait(self, check_interval=0.01):
# Instead of a blocking OS call, this version of wait() uses logic
# borrowed from the eventlet 0.2 processes.Process.wait() method.
try:
while True:
status = self.poll()
if status is not None:
return status
eventlet.sleep(check_interval)
except OSError, e:
if e.errno == errno.ECHILD:
# no child process, this happens if the child process
# already died and has been cleaned up
return -1
else:
raise
wait.__doc__ = subprocess_orig.Popen.wait.__doc__
if not subprocess_orig.mswindows:
# don't want to rewrite the original _communicate() method, we
# just want a version that uses eventlet.green.select.select()
# instead of select.select().
try:
_communicate = new.function(subprocess_orig.Popen._communicate.im_func.func_code,
globals())
except AttributeError:
# 2.4 only has communicate
_communicate = new.function(subprocess_orig.Popen.communicate.im_func.func_code,
globals())
def communicate(self, input=None):
return self._communicate(input)
# Borrow subprocess.call() and check_call(), but patch them so they reference
# OUR Popen class rather than subprocess.Popen.
call = new.function(subprocess_orig.call.func_code, globals())
try:
check_call = new.function(subprocess_orig.check_call.func_code, globals())
except AttributeError:
pass # check_call added in 2.5
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